Plant box



FIG. 1 is a perspective view of a plant box.

FIG. 2 is a front elevational view thereof, the rear elevational view being a mirror image of the front view.

FIG. 3 is a right side elevational view thereof, the left side elevational view being a mirror image of the right side view.

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a plant box, as shown and described. 